<template>
    <div class="cmt-container">
        <h3>发表评论</h3>
        <hr>
        <textarea placeholder="请输入要BB的内容（最多吐槽200字）" maxlength="200"
        v-model="msg">

        </textarea>
        <mt-button type='primary' size='large' @click="postComment">发表评论</mt-button>
        <div class="cmt-list">
            <div class="cmt-item" v-for="(item,i) in comments" :key="item.id">
                <div class="cmt-title">
                    第{{i+1}}楼&nbsp;&nbsp;用户：{{item.user_name}}&nbsp;发表时间：
                    {{item.add_time | dataFormat}}

                </div>
                <div class="cmt-body">
                    {{item.content === 'undefined' ? '此用户很懒,没有写评论': item.content}}

                </div>

            </div>
        </div>
        <mt-button type='danger' size='large' plain @click="getMore">加载更多</mt-button>
    </div>
</template>

<script>
  import { Toast } from "mint-ui";
export default {
  data() {
    return {
      pageIndex: 1, // 默认展示第一页数据
      comments: [] ,
      msg: ''// 所有的评论数据
    };
  },
  created() {
    this.getComments();
  },
  methods: {
    getComments() {
      // 获取评论
      this.$http
        .get("api/getcomments/" + this.id + "?pageindex=" + this.pageIndex)
        .then(result => {
          if (result.body.status === 0) {
            // this.comments = result.body.message;
            // 每当获取新评论数据的时候，不要把老数据清空覆盖，而是应该以老数据，拼接上新数据
            this.comments = this.comments.concat(result.body.message);
          } else {
            Toast("获取评论失败！");
          }
        });
    },
    getMore() {
         this.pageIndex++;
         this.getComments();

    },
    postComment() {
        if(this.msg.trim().length === 0){
            Toast('评论内容不能为空')
        }
        this.$http
        .post("api/postcomment/" + this.id,{content:this.msg.trim()})
        // 这里的id用this.$route.params.id也是可以的
        .then(result => {
            if(result.body.status === 0){
                var cmt = {
                    user_name: '匿名用户',
                    add_time: Date.now(),
                    content: this.msg
                };
                this.comments.unshift(cmt);
                this.msg =""
                

            }
            else {
                Toast('评论失败')
            }

        })
    }
  },
  props: ["id"] 
};
</script>

<style lang="scss" scoped>
    .cmt-container{
        h3{
            font-size: 18px;
        }
        textarea{
            font-size: 14px;
            height: 85px;
            margin: 0;
        }
        .cmt-list{
            margin: 5px 0;
            .cmt-item{
                font-size: 13px;
                 .cmt-title{
                     line-height: 30px;
                     background-color: #ccc;
                     
                }
                .cmt-body{
                    line-height: 35px;
                    text-indent: 2em;

                }

            }

        }
    }
    
  
   
</style>